From TBS press release:

Tuesday night’s episode [Nov. 9, 2010] of TBS’s "Conan" had another strong performance with young viewers, delivering 1,415,000 adults 18-34 and 2,126,000 adults 18-49. Conan was watched by 2,815,000 viewers overall. The median age for "Conan" is tracking around 30.

That adults 18-49 viewership works out to be a 1.6 adults 18-49 rating, down 36% from his premiere’s 2.5 rating. The 2.8 million average viewership was down 33% from the premiere’s 4.2 million.